Quantity is how many containers you have. The result is how many tributaries fit, the path, and the leftover line rate. The choices stay in the URL, so you can share them.

Result: standard mapping

How many OC-3s are in an ODU4?

An ODU4 carries 640 OC-3s, per ITU-T G.709 and Telcordia GR-253. This path maps OC-192 into ODU2 as a client, then follows that client's tributaries.

640

OC-3s in an ODU4

Working

ODU4 → 10 × ODU2 → 1 × OC-192 → 64 × OC-3

10 × ODU2 in each ODU4 ITU-T G.709Ten ODU2s use all 80 tributary slots, eight slots each.
1 × OC-192 in each ODU2 ITU-T G.709Client mappingCBR OC-192, the same client rate as STM-64, mapped into OPU2.
64 × OC-3 in each OC-192 Telcordia GR-25364 × OC-3. Channelized OC-192 is 192 STS-1s.

10 ODU2s
10 × 1 = 10 OC-192s
10 × 1 × 64 = 640 OC-3s

Leftover capacity

5.261645815 Gbit/s of each ODU4 line rate (104.794445815 Gbit/s) sits outside 640 × 155.520 Mbit/s of OC-3 line rate (99.532800 Gbit/s). That remainder is overhead, fixed stuff or justification. It is not another whole tributary.

By bit rate only

Dividing the line rates gives 673.83, which floors to 673 OC-3s by bit rate only. The standard mapping is 640. Use the mapping.

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